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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <h1><a href="https://www.baidu.com/" id='aHref'>百度</a></h1>
    <button id='btn'>新窗口打开百度</button>
    <button id='openchild'>打开子窗口</button>
    <div class="box"></div>
    <script src='./render/demo1.js'></script>
</body>
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